St. Catharines Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
May 01, 2019 to April 30, 2020.

Volume is measured in megalitres. (1 megalitre = 1 million litres)

CSO Location Date of Overflow Volume (ML) Reason for Overflow
Port Weller Plant
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Apr 30, 2020 1264.112 ML Heavy Precipitation
Port Dalhousie Plant
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Apr 9, 2020 2.061 ML Heavy Precipitation
Port Weller Plant
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Apr 9, 2020 1118.170 ML Heavy Precipitation
Port Weller Plant
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Mar 28, 2020 0.015 ML Heavy Precipitation
Port Dalhousie Plant
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Mar 3, 2020 0.976 ML Heavy Precipitation
Port Weller Plant
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Mar 3, 2020 2.981 ML Heavy Precipitation
Port Weller Plant
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Mar 3, 2020 4.337 ML Heavy Precipitation
Port Weller Plant
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Jan 25, 2020 12.584 ML Heavy Precipitation
Port Dalhousie Plant
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Jan 25, 2020 7.390 ML Heavy Precipitation
Port Dalhousie Plant
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Jan 25, 2020 16.466 ML Heavy Precipitation
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Historical Overflow Data for St. Catharines

201920182017
Total Overflows: 74
Total Volume: 533.880 ML
Total Overflows: 60
Total Volume: 787.151 ML
Total Overflows: 69
Total Volume: 1285.870 ML

Overflows contain mostly Storm Water

While the volume of an overflow may seem large, the amount of untreated sewage present in the overflow is small when compared to the amount of stormwater or snow melt.

Niagara typically treats about 80,000 megalitres of sewage each year.  The vast majority of wastewater discharged into the sewer system receives full treatment and only a small percentage of this sewage overflows. These overflows usually only occur during periods of heavy rain or during seasonal snow melts.

Historical Data

If you require more detailed information about a specific combined sewage overflow, you can contact the water & wastewater division.

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